Instead of selecting the default interface setting when preparing
isochronous transfers, select it on the first call to open() to make
sure it is available earlier.
---
drivers/staging/tm6000/tm6000-video.c | 17 ++++++++++++-----
1 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/tm6000/tm6000-video.c
b/drivers/staging/tm6000/tm6000-video.c
index 70fc19e..b59a0da 100644
--- a/drivers/staging/tm6000/tm6000-video.c
+++ b/drivers/staging/tm6000/tm6000-video.c
@@ -595,11 +595,6 @@ static int tm6000_prepare_isoc(struct tm6000_core *dev)
tm6000_uninit_isoc(dev);
/* Stop interrupt USB pipe */
tm6000_ir_int_stop(dev);
-
- usb_set_interface(dev->udev,
- dev->isoc_in.bInterfaceNumber,
- dev->isoc_in.bAlternateSetting);
-
/* Start interrupt USB pipe */
tm6000_ir_int_start(dev);
@@ -1484,6 +1479,18 @@ static int tm6000_open(struct file *file)
break;
}
+ if (dev->users == 0) {
+ int err = usb_set_interface(dev->udev,
+ dev->isoc_in.bInterfaceNumber,
+ dev->isoc_in.bAlternateSetting);
+ if (err < 0) {
+ dev_err(&vdev->dev, "failed to select interface %d, "
+ "alt. setting %d\n",
+ dev->isoc_in.bInterfaceNumber,
+ dev->isoc_in.bAlternateSetting);
+ }
+ }
+
/* If more than one user, mutex should be added */
dev->users++;
--
1.7.6
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